Classification Zones; Equipment Group Ii, Category 1 (Zones 0 And 20); Equipment Group Ii, Category 2 (Zones 1 And 21); Equipment Group Ii, Category 3 (Zones 2 And 22) - Flow vision FC01-Ex User Handbook Manual

Definitions and mounting instructions

2 .2 Classification Zones

Classification zones are described for areas where combustible gases, vapours or mist constitute
an explosive hazard. When determining the explosion hazard, i.e. when categorising explosive areas,
the European standard EN 13237, "Potentially explosive atmospheres - Terms and definitions for
equipment and protective systems intended for use in potentially explosive atmospheres" have to be
taken into account. In special cases or in case of doubt the determination is done by the supervising
authorities.

2 .2 . 1 Equipment group II, category 1 (Zones 0 and 20)

Equipment of this category is for use in areas where an explosive atmosphere consisting of gas,
vapour, mist (zone 1) or of inflammable dust/air mixtures (zone 20) is present continuously or for long
periods. Normally this applies only to the inside of containers or apparatus (vaporizers, pipe systems
etc.). In these zones only electrical apparatus must be used carrying an EC type test certificate issued
by an acknowledged authority and only those which have been explicitly approved for these zones.

2 .2 .2 Equipment group II, category 2 (Zones 1 and 21)

Equipment of this category is for use in areas where an explosive atmosphere consisting of gas, vapour,
mist (zone 1) or a cloud of inflammable dust in air (zone 21) is likely to occur. This may be the case
for the surroundings of zones of category 1, the surrounding area of filling or draining systems.
For zone 21 these are also areas where dust deposits occur and during normal operation may build
up an explosive concentration of inflammable dust in combination with air.

2 .2 .3 Equipment group II, category 3 (Zones 2 and 22)

Equipment of this category is for use in areas where an explosive atmosphere consisting of gas,
vapour, mist (zone 2) or a cloud of inflammable dust in air (zone 22) is unlikely to occur. If it does, it
would be infrequent and for a short time. This may be the case for the surroundings of zones 0 and
1 as well as areas around flange connections or pipe lines in closed areas.
For zone 22 it could also be surroundings of dust-containing apparatus, protective systems and
components which might lose dust from leakages and build up dust deposits (e.g. mill rooms, clean
air side of filters in outlet air pipes).
(Information about zones and categories in accordance with EN 1127-1:2011 [detailed for inflammable
gas, vapour and dust: EN 60079-0:2012], rules for avoid danger by explosive atmosphere and classifica-
tion of explosion protection zones, with example library [BGR 104, Explosionsschutz-Regeln - EX-RL])
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